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B1BBA




B1BBA-PASSENGER SEAT WEIGHT SENSOR SUPPLY CIRCUIT






For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

- When Monitored:
While the CAN bus ignition status is in IGN_RUN, the module checks the sensor supply.

- Set Condition:
If the Occupant Classification Module (OCM) detects that the sensor supply shorted.
NOTE: A shorted supply circuit will cause a 'NO RESPONSE FROM OCM" condition.

Possible Causes:







1. VERIFY THAT B1BBA-PASSENGER SEAT WEIGHT SENSOR SUPPLY CIRCUIT DTC IS ACTIVE
1. With the scan tool, read the OCM DTCs.

Does the scan tool display active B1BBA-PASSENGER SEAT WEIGHT SENSOR SUPPLY CIRCUIT DTC?

Yes

- WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

- WARNING: If the Occupant Classification Module (OCM) is dropped at any time, it must be replaced. Failure to take the proper precautions could result in accidental airbag deployment and may result in possible serious or fatal injury.

- Replace the OCM.
- Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.

No

- Go To 2

2. INSPECT PASSENGER SEAT HARNESS WIRES AND CONNECTORS

WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

1. Using the wiring diagram/schematic as a guide, inspect the Passenger Seat Harness wiring and connectors. Look for chafed, pierced, pinched or partially broken wires and broken, bent, pushed out, spread, corroded or contaminated terminals.

Are any of these conditions present?

Yes

- NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if the condition inspecting or testing for is present in the Seat Harness.

- Replace the Passenger Seat Harness.
- Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.

No

- Go To 3

3. CHECK VOLTAGE OF (R701) SEAT WEIGHT SENSOR 5 VOLT SUPPLY CIRCUIT

1. Disconnect all the Seat Weight Sensor harness connectors.

WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

2. Measure the voltage of the (R701) Seat Weight Sensor 5 Volt supply circuit on all four seat weight sensors.

Is the voltage above 4.8 volts?

Yes

- Go To 6

No

- Go To 4

4. CHECK THE PASSENGER SEAT WEIGHT SENSOR 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND

WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

1. Disconnect the OCM C2 harness connectors.

2. Measure the resistance of the (R701) LT-FT, RT-FT, RT-R, and LT-R Seat Weight Sensor 5 volt supply circuit, between ground and the OCM C2 harness connector.

Is the resistance below 5 Ohms for any of the LT-FT, RT-FT, LT-R, and RT-R seat weight sensor 5 volt supply circuits?

Yes

- NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if any of these conditions exist.
- Replace the suspect Passenger Seat Harness.
- Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test

No

- Go To 5

5. CHECK (R701) SEAT WEIGHT SENSOR 5 VOLT SUPPLY CIRCUIT FOR AN OPEN

WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

1. Disconnect the OCM C2 harness connectors.

2. Measure the resistance of the (R701) Seat Weight Sensor 5 Volt circuit between the OCM C2 connector and the Seat Weight Sensor harness connector.

Is the resistance below 5 Ohms for any of the LT-FT, RT-FT, LT-R, and RT-R seat weight sensor 5 volt supply circuits?

Yes

- Replace the OCM.
- Perform the B1BA7 - OCCUPANT CLASSIFICATION SYSTEM VERIFICATION REQUIRED diagnostic procedure. B1BA7
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test

No

- NOTE: Do not attempt to repair the Seat Harness. Replace the Seat Harness if any of these conditions exist.
- Replace the Passenger Seat Harness.
- Perform the RE-ZERO OCM SEAT WEIGHT SENSORS diagnostic procedure. Re-Zero OCM Seat Weight Sensors.
- Perform the AIRBAG SYSTEM VERIFICATION TEST. Airbag System Verification Test


6. TEST FOR INTERMITTENT CONDITION

1. With the scan tool, record and erase all DTCs from the OCM.

2. If any ACTIVE codes are present they must be resolved before diagnosing any stored codes.

WARNING: Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

3. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

4. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.

5. The following additional checks may assist you in identifying a possible intermittent problem.

6. Reconnect any disconnected components and harness connector.

WARNING: Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

7. With the scan tool monitor active codes as you work through the following steps.

WARNING: Maintain a safe distance from all airbags while performing the following steps. Failure to follow these instructions may result in possible serious or fatal injury.

8. Wiggle the wiring harness and connectors of the related airbag circuit or component.

9. If only stored codes return continue the test until the problem area has been isolated.

10. In the previous steps you have attempted to recreate the conditions responsible for setting the active DTC in question.

Are any ACTIVE DTCs present?

Yes

- Select the appropriate DTC from DTC list. Testing and Inspection


No

- No problem found at this time. Perform the Occupant Classification Module System Verification Test. Verification Tests Erase all codes before returning vehicle to customer.




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